diff --git a/src/Dotnet.Samples.AspNetCore.WebApi/Mappings/PlayerMappingProfile.cs b/src/Dotnet.Samples.AspNetCore.WebApi/Mappings/PlayerMappingProfile.cs
index e444719..6118ad7 100644
--- a/src/Dotnet.Samples.AspNetCore.WebApi/Mappings/PlayerMappingProfile.cs
+++ b/src/Dotnet.Samples.AspNetCore.WebApi/Mappings/PlayerMappingProfile.cs
@@ -37,7 +37,7 @@ public PlayerMappingProfile()
             )
             .ForMember(
                 destination => destination.Birth,
-                options => options.MapFrom(source => $"{source.DateOfBirth:MMMM d, yyyy}")
+                options => options.MapFrom(source =>source.DateOfBirth.HasValue? $"{source.DateOfBirth:MMMM d, yyyy}":string.Empty)
             )
             .ForMember(
                 destination => destination.Dorsal,